The move comes after an FDA Panel found that 60 percent of adults deaths involving acetaminophen occur when taking a prescription medication. "Acetaminophen is safe when used as directed," Dr. Edwin Kuffner, vice president of OTC Medical Affairs and Clinical Research at McNeil Consumer Healthcare, said in a statement. "But, when too much is taken, it [overdosing] can cause liver damage. Some people accidentally exceed the recommended dose when taking multiple products at the same time, often without realizing they contain acetaminophen or by not reading and following the dosing instructions."

Today's announcement affects only Extra Strength Tylenol. Previously, the maximum dosage was 4,000 milligrams, or eight pills, daily. The new recommended dose, which will appear on labels this fall, is 3,000 milligrams, or six pills, over the course of a day.

Starting in 2012, regular-strength Tylenol and other Tylenol products for adults will have lower dosages listed on their labels as well.